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\frac{7}{4+7+5} \times \frac{6}{4+6+5} \times \frac{5}{4+5+5} \times \binom{3}{2}
\frac{7}{4+7+5} \times \frac{6}{4+6+5} \times \frac{5}{4+5+5} \times \binom{3}{2}
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